The Metrodata LH1000 is designed to enable the transmission of LAN frames across satellite links via serial modems. The LAN interface is auto-sensing and supports 10M, 100M, full or half duplex working. Manual selection of 100BaseT FD operation enables connection to fixed config router ports. It is presented as an RJ45 connector and offers automatic MDI/MDI-X interface selection to obviate the need for cross-over cables. The LAN interface utilises an efficient HDLC encapsulation with address learning and filtering at up to 148810 packets per second. Rate decoupling is supported by means of a 1000 packet SDRAM buffer store, and no packets are lost providing that the sustained data rate is below the DTE serial port speed.

Two DTE ports are provided. They can operate at asymmetric speeds since they are clocked using the DCE supplied Send & Receive Timing signals. The ports are:

• a high speed HSSI DTE port using a standard 50-way SCSI-2 connector at a DCE clock rate of up to 100Mbps
• a low speed multi-standard port using a 44-way D-Type connector at clock rates up to 20Mbps

The low speed multi-standard port offers the options of RS-232, EIA-530, X.21, V.35, RS449/ V.36 interfaces, depending upon the type of interface cable fitted to the port.

The LH1000 can be specified for 100-250 VAC mains supply or -48 VDC

Product Features

1. Must be used in pairs.
2. Quad option available - 4 LH1000's in 1U box
3. Low-cost LAN extension over satellite links
4. 10 / 100BaseT auto-negotiating LAN port
5. Filtering of local packets
6. Efficient HDLC packet handling on WAN port
7. HSSI interface at up to 100 Mbps
8. Multi-standard serial interface supports RS-232, X.21, EIA-530,V.35, V.36at up to 20 Mbps
9. Mixed Tx and Rx interface operation e.g. HSSI Tx & EIA-530 Rx
10. Asymmetric operation
11. Integral auto-sensing PSU

Application Diagram

Product Images

Specifications